Many clients like the ease of creating things like Bookings and Phases in the Crew Planning and Project Timeline apps. A simple click+drag is all it takes. We've heard from some clients they'd like this same sort of functionality on Task pages with the gantt. Rather than input start/end/duration values into the fields a user could instead click+drag to create that data visually.
Would this feature be useful to you? If so click the "Me too!" button and leave any additional use cases/functionality you'd like to see in the comments.